diff --git a/tests/middleware_tests/test_fieldkeys.py b/tests/middleware_tests/test_fieldkeys.py
index 2eb8125..b3db827 100644
--- a/tests/middleware_tests/test_fieldkeys.py
+++ b/tests/middleware_tests/test_fieldkeys.py
@@ -1,9 +1,11 @@
+import re
+
+import pytest
+
 from bibtexparser import Library
 from bibtexparser.middlewares.enclosing import RemoveEnclosingMiddleware
 from bibtexparser.middlewares.fieldkeys import NormalizeFieldKeys
 from bibtexparser.model import Entry, Field
-import re
-import pytest
 
 entries = {
     "article": {